Dates and rates in ancient lakes: 40Ar–39Ar evidence for an Early Cretaceous age for the Jehol Group, northeast China

1995 ◽  
Vol 32 (9) ◽  
pp. 1426-1431 ◽  
Author(s):  
Patrick E. Smith ◽  
Norman M. Evensen ◽  
Derek York ◽  
Mee-Mann Chang ◽  
Fan Jin ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Northeast China ◽  
Late Jurassic ◽  
Lacustrine Sediments ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Absolute Calibration ◽  
Small Fault ◽  
Absolute Age ◽  
Good Agreement

The correlation of freshwater sediments in small, fault-bound basins in Liaoning Province, northeast China, known as the Jehol (or Rehe) Group, has been a subject of debate for many years, with biochronological estimates ranging from Late Jurassic to the Cretaceous periods. We have applied the laser 40Ar–39Ar technique to volcanic intercalations and lacustrine sediments from the Yixian Formation at the base of the Jehol Group. Minerals and whole-rock chips from the upper parts of the Yixian Formation give concordant ages with a mean of 121.1 ± 0.2 Ma (1σ). Ages for samples near the base of the Yixian Formation give 121.4 ± 0.6 and 122.9 ± 0.3 Ma, and appear to be synchronous or only slightly older than the top of the formation. Integrated ages of 122 Ma for glaucony from the lacustrine sediments lying stratigraphically between the upper and lower parts of the Yixian are in very good agreement with the absolute age framework provided by the volcanic units. Such disseminated facies of this clay show promise for directly dating lacustrine sediments. All of the above 40Ar–39Ar dates provide an absolute calibration of the Yixian Formation, and show that the whole formation was deposited entirely within Early Cretaceous time over an interval of no more than 2–3 Ma.

Fossil flower bugs (Heteroptera: Cimicomorpha: Cimicoidea) from the Late Jurassic of Northeast China, including a new family, Vetanthocoridae

Zootaxa ◽  
2006 ◽  
Vol 1360 (1) ◽  
pp. 1 ◽  
Author(s):  
YUNZHI YAO ◽  
WANZHI CAI ◽  
DONG REN
Keyword(s):  
New Species ◽  
Northeast China ◽  
Late Jurassic ◽  
Northern China ◽  
Yixian Formation ◽  
Liaoning Province ◽  
New Genera ◽  
Western Liaoning ◽  
New Family ◽  
Fossil Records

An extinct new family of flower bugs, Vetanthocoridae fam. nov., with 2 new tribes, Vetanthocorini and Crassicerini, 8 new genera, and 9 new species (Byssoidecerus levigatus gen. & sp. nov., Collivetanthocoris rapax gen. & sp. nov., Vetanthocoris decorus gen. & sp. nov., Vetanthocoris longispicus gen. & sp. nov., Curvicaudus ciliatus gen. & sp. nov., Mecopodus xanthos gen. & sp. nov., Pustulithoracalis gloriosus gen. & sp. nov., Curticerus venustus gen. & sp. nov., and Crassicerus furtivus gen. & sp. nov.) are described from the Late Jurassic Yixian Formation in western Liaoning Province, China. These fossil records suggest there was an important diversity of flower bugs in the earlier Late Jurassic of northern China. A key to four flower-bug families and a key to the known fossil flower bugs are provided.

Mesocoprophilus clavatus, a new oxyteline rove beetle (Coleoptera: Staphylinidae) from the Early Cretaceous of China

2013 ◽  
Vol 44 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Chenyang Cai ◽  
Diying Huang
Keyword(s):  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Northeast China ◽  
New Genus ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Abdominal Sternite ◽  
Rove Beetle

Mesocoprophilus clavatus gen. et sp.n., a new rove beetle belonging to the Recent subfamily Oxytelinae, is described and illustrated on the basis of a well-preserved specimen from the Lower Cretaceous Yixian Formation near Huangbanjigou, Beipiao City, Liaoning Province, Northeast China. This new genus can be placed in the extant tribe Coprophilini as supported by its general habitus, sub-contiguous mesocoxae, 5-segmented metatarsi, and abdominal segments III–VII each with two pairs of paratergites. In addition, it displays some features resembling the more basal tribe Euphaniini, including clavate antennae and short and poorly-sclerotized abdominal sternite II.

The postcranial skeleton of the iguanodontian ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of western Liaoning, China

2010 ◽  
Vol 101 (2) ◽  
pp. 135-159 ◽  
Author(s):  
Xiaolin Wang ◽  
Rui Pan ◽  
Richard J. Butler ◽  
Paul M. Barrett
Keyword(s):  
New Taxa ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Northeast China ◽  
Strong Support ◽  
Middle Part ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Postcranial Skeleton ◽  
Lower Aptian

ABSTRACTNon-hadrosaurid iguanodontians were the most diverse and abundant group of large-bodied herbivorous dinosaurs during the Early Cretaceous, and were a particularly important component of Laurasian ecosystems. Recent years have seen a dramatic increase in our knowledge of the diversity of this group, with multiple new taxa being described from northeast China. The most complete of these Chinese non-hadrosaurid iguanodontians is Jinzhousaurus yangi, from the middle part of the Yixian Formation (Lower Cretaceous: lower Aptian) of Liaoning Province. Here, we provide the first description of the relatively complete and partially articulated postcranial skeleton of the holotype of Jinzhousaurus, and provide detailed comparisons to closely related taxa. We document additional autapomorphies of Jinzhousaurus that provide strong support for the validity of this taxon.

A new genus of Scolebythidae (Hymenoptera: Chrysidoidea) from the Early Cretaceous of China

Zootaxa ◽  
2012 ◽  
Vol 3504 (1) ◽  
pp. 56 ◽  
Author(s):  
YAPING CAI ◽  
YUNYUN ZHAO ◽  
CHUNGKUN SHIH ◽  
DONG REN
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Type Species ◽  
New Genus ◽  
Northeastern China ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Comprehensive Understanding ◽  
The Family ◽  
Two New Species

A new genus Mirabythus Cai, Shih et Ren, gen. nov. (type species, M. lechrius Cai, Shih et Ren, sp. nov.) and M. liae Cai, Shih et Ren, sp. nov. from the family Scolebythidae are described from the Early Cretaceous Yixian Formation of Huangbanjigou Village, Liaoning Province, northeastern China. These findings extend the existence of Scolebythidae to the Early Cretaceous of China, while providing evidence to support Engel and Grimaldi’s hypothesis that the family was widely distributed throughout the Cretaceous. Our two new species with clear venation also provide a comprehensive understanding of the venational changes from the Early Cretaceous to now. A key to the fossil and extant genera of Scolebythidae is provided.

A new eucryptodiran turtle from the Early Cretaceous Jiufotang Formation of western Liaoning, China

Zootaxa ◽  
2010 ◽  
Vol 2676 (1) ◽  
pp. 45 ◽  
Author(s):  
CHANG-FU ZHOU
Keyword(s):  
Early Cretaceous ◽  
Cladistic Analysis ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Jehol Biota ◽  
Western Liaoning ◽  
The Third

A new eucryptodiran turtle from the Jiufotang Formation of Lamadong, Jianchang County, represents the third turtle taxon, Liaochelys jianchangensis gen. et sp. nov., from the Jehol Biota of western Liaoning Province, China. This taxon is diagnosed by a character combination including a midline contact of the prefrontals, vertebrals wider than long, third costals strongly expanded distally, and a medial contact of the eighth costals. A preliminary cladistic analysis places Liaochelys jianchangensis along the phylogenetic stem of Cryptodira in a position more derived than the taxa, Manchurochelys manchoukuoensis and Ordosemys liaoxiensis, known from the underlying Yixian Formation. This discovery opens a new window into the osteology and evolution of primitive eucryptodiran turtles.

scholarly journals A new fossil mordellid (Coleoptera: Tenebrionoidea: Mordellidae) from the Yixian Formation of Western Liaoning Province, China

Zootaxa ◽  
2007 ◽  
Vol 1415 (1) ◽  
pp. 49-56 ◽  
Author(s):  
MING LIU ◽  
WENHUA LU ◽  
DONG REN
Keyword(s):  
New Species ◽  
Late Jurassic ◽  
New Genus ◽  
Hind Femur ◽  
Yixian Formation ◽  
Liaoning Province ◽  
New Genus And Species ◽  
Ne China ◽  
Western Liaoning ◽  
Fossil Specimen

A new genus and species, Mirimordella gracilicruralis gen. et sp. nov., in the subfamily Praemordellinae of Mordellidae, is described and illustrated based on a nearly complete fossil specimen. It is from the Yixian Formation of western Liaoning Province, NE China. The diagnosis of the subfamily Praemordellinae is emended based on this new species. Characters such as simple and linear maxillary palpi, simple claws, simple penultimate segments of fore and middle tarsi, small hind coxal plates, slender hind femora, only apical ridges on hind tibiae and tarsi, and no elongated last tergum suggest that Praemordellinae might be the precursor of modern mordellids. The resemblance between the new species and the Late Jurassic Praemordella martynovi indicates close relationships between them and with the tribe Stenaliini in the subfamily Mordellinae. The position of epicoxa and slender hind femur suggest that the new species may be more primitive than Praemordella martynovi and may indicate the age of the Yixian Formation no later than Late Jurassic.

A new genus and two new species of fossil Elaterids from the Yixian Formation of Western Liaoning, China (Coleoptera: Elateridae)

Zootaxa ◽  
2008 ◽  
Vol 1785 (1) ◽  
pp. 54 ◽  
Author(s):  
HUALI CHANG ◽  
FAN ZHANG ◽  
DONG REN
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Jurassic ◽  
New Genus ◽  
Upper Jurassic ◽  
Yixian Formation ◽  
Western Liaoning ◽  
Two New Species

A new genus and two new species of fossil Elateridae are described and illustrated: Paralithomerus gen. nov., P. exquisitus sp. nov, and P. parallelus sp. nov. Both species were collected from the Late Jurassic-Early Cretaceous Yixian Formation of western Liaoning, China. Fossil elaterids expressing a sutured mesoventrite have been otherwise discovered only from the Upper Jurassic strata of Karatau.

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